The Bigger Stem Cells Are, the Harder They Fall

SciShow is supported by Go to to get 20 off of an annual Premium subscription. When it comes to our bloodproducing stem cells, biologists have learned that bigger is not better. And a study has taken a look at the accomplishments and obstacles of an inprogress attempt to restore a large belt of degraded land stretching across Africa. Hosted by: Hank Green SciShow is on TikTok Check us out at Support SciShow by becoming a patron on Patreon: Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Alisa Sherbow, Silas Emrys, Chris Peters, Adam Brainard, Dr. Melvin Sanicas, Melida Williams, Jeremy Mysliwiec, charles george, Tom Mosner, Christopher R Boucher, Alex Hackman, Piya Shedden, GrowingViolet, Nazara, Matt Curls, Ash, Eric Jensen, Jason A Saslow, Kevin Bealer, Sam Lutfi, James Knight, Christoph Schwanke, Bryan Cloer, Jeffrey Mckishen Looking for SciShow elsewhere on the internet SciShow Tangents Podcast: Facebook: Twitter: Instagram: Sources: Images: